Reply from @prachiz The issue is resolved. I was trying to register
service user for com..core as below code, but my OSGi bundle
symbolic name was core only, however, I'm not sure why bundle name
didn't have artifact id. Ideally, BSN should have GroupID+ ArtifactID or
ArtifactID.
user.mapping="com..core:excel-service-user=excel-service-user"/>